Class: Haconiwa::Runners::Linux

Inherits:
Object
  • Object
show all
Defined in:
lib/haconiwa/runners/linux.rb

Overview

see d.hatena.ne.jp/hiboma/20120518/1337337393

Class Method Summary collapse

Class Method Details

.attach(base, run_command = []) ⇒ Object 



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# File 'lib/haconiwa/runners/linux.rb', line 70

def self.attach(base, run_command=[])
  if run_command.empty?
    run_command << "/bin/bash"
  end

  wrapper = Tempfile.open("haconiwa-attacher-#{$$}-#{Time.now.to_i}.sh")

  wrapper.puts "#!/bin/bash"
  wrapper.puts "chroot #{base.filesystem.chroot} bash -c '"
  wrapper.puts "cd / ;"
  wrapper.puts Shellwords.shelljoin(["exec", *run_command]).gsub(/'/, %<'"'"'>)
  wrapper.puts "'"
  wrapper.close
  FileUtils.chmod 0700, wrapper.path

  runner = fork {
    base.pid ||= File.read(base.container_pid_file).to_i

    if base.attached_capabilities
      base.attached_capabilities.apply!
    end

    base.cgroup.attach(to: base.name)
    Bundler.with_clean_env { base.namespace.enter(pid: base.pid, wrapper_path: wrapper.path) }
  }

  puts "Attached to contanier: Runner PID = #{runner}"

  res = Process.waitpid2 runner
  if res[1].success?
    puts "Successfully exit."
  else
    puts "Attached process exited with status code <#{res[1].to_i}>."
  end
end

.run(base, init_command = []) ⇒ Object 



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# File 'lib/haconiwa/runners/linux.rb', line 10

def self.run(base, init_command=[])
  container = fork {
    if init_command.empty?
      init_command = Array(base.init_command)
    end

    base.namespace.apply!
    base.cgroup.register_all!(to: base.name)

    base.filesystem.mount_all!

    Dir.chroot base.filesystem.chroot
    Dir.chdir "/"

    wrapper = Tempfile.open("haconiwa-wrapper-#{$$}-#{Time.now.to_i}.sh")

    wrapper.puts "#!/bin/bash"
    wrapper.puts "/bin/bash -c '"
    if base.filesystem.mount_independent_procfs
      wrapper.puts "mount -t proc proc /proc;"
    end
    wrapper.puts "exec $@;"
    wrapper.puts "' -- \"$@\""
    wrapper.close
    FileUtils.chmod 0700, wrapper.path

    Haconiwa::Base.sethostname(base.name)

    base.capabilities.apply!

    if base.namespace.use_pid_ns
      Bundler.with_clean_env {
        exec "unshare", "--pid", "--", wrapper.path, *init_command
      }
    else
      Bundler.with_clean_env { exec wrapper.path, *init_command }
    end
  }

  sleep 0.1 # The magic
  Haconiwa::SmallCgroup.register_at_exit(pid: container, name: base.name, dirs: base.cgroup.to_dirs)
  real_container_pid = if base.namespace.use_pid_ns
                         find_by_ppid(container)
                       else
                         container
                       end
  File.open(base.container_pid_file, "w") {|pid| pid.write real_container_pid }
  Signal.trap(:INT) { Process.kill :TERM, container }
  puts "New container: Name = #{base.name}, PID = #{real_container_pid}"

  res = Process.waitpid2 container
  if res[1].success?
    puts "Successfully exit container."
  else
    puts "Container exited with status code <#{res[1].to_i}>."
  end

  at_exit { FileUtils.rm_f base.container_pid_file }
end